The screen is supposed to go black when you are on the phone as so your face does not push buttons. as far as it not coming back on try hitting the power/home buttons a few times before doing a battery pull.

The screen is supposed to go black when you are on the phone as so your face does not push buttons. as far as it not coming back on try hitting the power/home buttons a few times before doing a battery pull.

Just as a test, try making a call. When it goes black, put it to your ear and take it back away. Does this wake it up? Does it wake back up after someone hangs up? Or does it just turn off and there's no coming back without a reboot?

Just as a test, try making a call. When it goes black, put it to your ear and take it back away. Does this wake it up? Does it wake back up after someone hangs up? Or does it just turn off and there's no coming back without a reboot?

Did not think about that, if they are not triggering the proximity sensor it might be getting confused.

As mentioned the black screen is a feature (not a bug). It is used for a couple reasons

1) So you don't hit a button on the screen by accident.
2) Making a phonecall is one of the most taxing things on battery, so the screen being off prevents un-needed drain.

When the screen goes black can you still talk on the phone? Have you tried putting the phone up to your ear and then taking it away while it's black? If you attempt to call the phone (or text it) does it respond?